Fluid-pressure motor



Dec. 24, 1929. E. G. GARTIN 1,740,633

FLUID PRES SURE MOTOR Filed D60 17, 1923 Patented Dec. 24, 1929 UNITEDSTATES PATENT OFFICE ELMER G. GARTIN, OF GLAREMONT, NEW

HAMPSHIRE, ASSIGNOR TO SULLIVAN MA- FLUID-PRESSURE MOTOR Applicationfiled December 17, 1923. Serial N'o. 681,146.

My invention relates to fluid pressure motors.

An object of my invention is to provide an improved pressure fluidmotor. Another object of my invention is to provide an improvedpercussive motor having an improved valve mechanism. Still anotherobject of my in vention is to provide an improved pressure fluidpercussive motor especially adapted for rock drilling purposes providedwith an improved valve mechanism of the multiple spool type having animproved guiding means, lubricating means, and bufler venting meanstherefor, and arrangement of parts thereof. These and other objects andadvantages of my invention will, however, hereinafter more fully appear.

In the accompanying drawings I have shown for purposes of illustrationone form -which my invention may assume in practice.

In these drawings,

Fig. 1 is a central longitudinal vertical sectional view of a drillingmotor in which an illustrative form of my invention is incorporated, theview being partially in side elevation.

Fig. 2 is a view similar to that shown in Fig. 1 with parts assumed indifferent positions.

Figs. 3 and 1 are detail end elevation views of a portion of my improvedmechanism.

Fig. 5 is a perspective view illustrating the locking member. 1

In this illustrative form of my invention, I have shown a pressure fluidpercussive motor of the valved type generally designated 1, whichcomprises a cylinder 2 having a bore 3 in which a piston 4 isreciprocable. The piston l is provided with a projecting striking bar 5adapted to percussivelyactuate a drill steel (not shown) suit-ablycarried by the front end of the drilling motor in a well known manner.The opposite ends of the bore of the cylinder 2 are closed by headmembers 6 and 7 suitablyheld in the desired assembled relation by meansof side rods (not shown) in the usual manner.

Pressure fluid is distributed alternately to the ends ofthe cylinder-bymeans of passages 8 and 9, the supply and exhaust of pressure fluidthrough the distribution passages 8, 9 being controlled by a valvemechanism of improved construction, generally designated 10. This valvemechanism comprises a casing or chest 11 in which suitable valvebushings 12 are so arranged as to form a chamber having end portions 13of slightly smaller diameter than its central portion 14. Herein, thepassages 8, 9 communicate with the valve chamber adjacent the ends ofthe enlarged central bore 1 1, terminating in annular grooves 15 and 16.Adjacent the extremities of the smaller bores 13, ports 17 and 18connect throwing or reverse passages 19 and 20 with the valve chamber,these passages at their opposite ends communicating with the bore of thecylinder 2 by longitudinally spaced ports 21 and 22. Intermediate theport 17 and groove 15 and port 18 and groove 16, respec tively, in thevalve chest there are formed annular grooves 23 and 2 1, which groovescommunicate by ports 25 and 26 with an exhaust passage 27 formed in aboxlike member 28 suitably secured to the top of the valve chest. Asillustrated, a valve, generally designated 29, is arranged within thevalve chest and is herein of the three spool type and comprises recessedend spools or heads 30 fitting the bores 13 and a central spool portion31 of slightly larger diameter fitting the bore 1 1-, the heads 30, 31being connected by reduced portions 32. Herein, it will be observed that'the outer ends of the bores 13 are closed by buffer members or plugs 33and 3a, with which the recessed ends of the valve are adapted to engage,which are held in the desired rigid assembled relation by means offlattened surfaces 33 and 3 1 engaging a corresponding flattened surfaceon the cylinder 2 and a centrally disposed longitudinally extending bolt35 provided with a head 36. The head 36 is provided with flattenedportions 37 which are adapted to engage the sides of a slot or groove 38in the valve bufler 33 thereby holding the buflers and bolt in rigidnon- IOtfitll'lg relation. This bolt 35 is provided with a'nut 39 whichis held in the desired tightened position by means of a locking member40 engaging the sides of a slot or groove 41 in the buffer plug 34.Herein, it will be lubricating said bolt including a spiral groove andports in said valve communicable therewith.

4. In a pressure fluid motor, a cylinder, a piston reciprocable therein,means for effecting reciprocation of said piston including a valvechest, a valve therein having throwing areas on opposite ends thereof,buffers limiting movement of said valve, a center bolt extending throughsaid valve for retaining said buffers in assembled relation, and meansprovided by said center bolt and controlled by said valve foralternately" venting said throwing areas on the ends of said valve.

5. In a pressure fluid motor, a cylinder, a piston reciprocable therein,means for effecting reciprocation of said piston including a valvechest, a valve therein, buffers limiting movement of said valve, acenter bolt extending axially through said valve for retaining saidbuffers in assembled relation, and means provided by said center boltcomprising separatepassages alternately opened and closed by said valvefor venting the space between the ends of said buflers and the ends ofsaid valve to exhaust the total end areas on said valve.

6. In a pressure fluid motor, a cylinder, a piston reciprocable therein,means for effecting. reciprocation of said piston including a valvechest having a bore, a valve therein having recessed end portions,buifer plugs having portions projecting within the bore in said valvechest and with which the recessed portions of said valve alternatelyengage, a center bolt extending through said valve for retaining saidbuffer plugs in assembled relation, and means provided by said bolt andcontrolled by said valve for alternately venting the space between theproj ecting portions of said buffer plugs and the recessed portions ofsaid valve and the space around said projecting portions.

l7. In a pressure fluid motor, a cylinder, a piston reciprocabletherein, and means for effecting reciprocation of said piston includinga valve chest, a valve therein, buffers limiting movement of said valve,means for retaining said buffers in assembled relation including acenter bolt on which said valve slides, locking means therefor, meanspro vided by said center bolt for alternately venting the space betweenthe ends of said bufiers and the ends of said valve, and means providedby said bolt intermediate said vent means for lubricating the valve. Q

In testimony whereof I afiix my signature.

' ELMER- Gr. GARTIN.

